1308 lines
35 KiB
Diff
1308 lines
35 KiB
Diff
From 2bb9c01de4c90a8b7a9b52be95f504177abeaf45 Mon Sep 17 00:00:00 2001
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From: popcornmix <popcornmix@gmail.com>
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Date: Wed, 3 Jul 2013 00:31:47 +0100
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Subject: [PATCH 010/121] cma: Add vc_cma driver to enable use of CMA
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Signed-off-by: popcornmix <popcornmix@gmail.com>
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vc_cma: Make the vc_cma area the default contiguous DMA area
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---
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drivers/char/Kconfig | 2 +
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drivers/char/Makefile | 1 +
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drivers/char/broadcom/Kconfig | 15 +
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drivers/char/broadcom/Makefile | 1 +
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drivers/char/broadcom/vc_cma/Makefile | 14 +
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drivers/char/broadcom/vc_cma/vc_cma.c | 1193 +++++++++++++++++++++++++++++++++
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include/linux/broadcom/vc_cma.h | 29 +
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7 files changed, 1255 insertions(+)
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create mode 100644 drivers/char/broadcom/Kconfig
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create mode 100644 drivers/char/broadcom/Makefile
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create mode 100644 drivers/char/broadcom/vc_cma/Makefile
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create mode 100644 drivers/char/broadcom/vc_cma/vc_cma.c
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create mode 100644 include/linux/broadcom/vc_cma.h
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--- a/drivers/char/Kconfig
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+++ b/drivers/char/Kconfig
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@@ -590,6 +590,8 @@ config DEVPORT
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source "drivers/s390/char/Kconfig"
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+source "drivers/char/broadcom/Kconfig"
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+
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config MSM_SMD_PKT
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bool "Enable device interface for some SMD packet ports"
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default n
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--- a/drivers/char/Makefile
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+++ b/drivers/char/Makefile
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@@ -62,3 +62,4 @@ js-rtc-y = rtc.o
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obj-$(CONFIG_TILE_SROM) += tile-srom.o
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obj-$(CONFIG_XILLYBUS) += xillybus/
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+obj-$(CONFIG_BRCM_CHAR_DRIVERS) += broadcom/
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--- /dev/null
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+++ b/drivers/char/broadcom/Kconfig
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@@ -0,0 +1,15 @@
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+#
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+# Broadcom char driver config
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+#
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+
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+menuconfig BRCM_CHAR_DRIVERS
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+ bool "Broadcom Char Drivers"
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+ help
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+ Broadcom's char drivers
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+
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+config BCM_VC_CMA
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+ bool "Videocore CMA"
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+ depends on CMA && BRCM_CHAR_DRIVERS && BCM2708_VCHIQ
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+ default n
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+ help
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+ Helper for videocore CMA access.
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--- /dev/null
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+++ b/drivers/char/broadcom/Makefile
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@@ -0,0 +1 @@
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+obj-$(CONFIG_BCM_VC_CMA) += vc_cma/
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--- /dev/null
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+++ b/drivers/char/broadcom/vc_cma/Makefile
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@@ -0,0 +1,14 @@
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+ccflags-y += -Wall -Wstrict-prototypes -Wno-trigraphs
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+ccflags-y += -Werror
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+ccflags-y += -Iinclude/linux/broadcom
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+ccflags-y += -Idrivers/misc/vc04_services
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+ccflags-y += -Idrivers/misc/vc04_services/interface/vchi
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+ccflags-y += -Idrivers/misc/vc04_services/interface/vchiq_arm
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+
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+ccflags-y += -D__KERNEL__
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+ccflags-y += -D__linux__
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+ccflags-y += -Werror
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+
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+obj-$(CONFIG_BCM_VC_CMA) += vc-cma.o
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+
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+vc-cma-objs := vc_cma.o
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--- /dev/null
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+++ b/drivers/char/broadcom/vc_cma/vc_cma.c
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@@ -0,0 +1,1193 @@
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+/**
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+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ * 1. Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions, and the following disclaimer,
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+ * without modification.
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+ * 2. Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in the
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+ * documentation and/or other materials provided with the distribution.
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+ * 3. The names of the above-listed copyright holders may not be used
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+ * to endorse or promote products derived from this software without
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+ * specific prior written permission.
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+ *
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+ * ALTERNATIVELY, this software may be distributed under the terms of the
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+ * GNU General Public License ("GPL") version 2, as published by the Free
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+ * Software Foundation.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/kthread.h>
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+#include <linux/fs.h>
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+#include <linux/device.h>
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+#include <linux/cdev.h>
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+#include <linux/mm.h>
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+#include <linux/proc_fs.h>
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+#include <linux/seq_file.h>
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+#include <linux/dma-mapping.h>
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+#include <linux/dma-contiguous.h>
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+#include <linux/platform_device.h>
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+#include <linux/uaccess.h>
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+#include <asm/cacheflush.h>
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+
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+#include "vc_cma.h"
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+
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+#include "vchiq_util.h"
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+#include "vchiq_connected.h"
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+//#include "debug_sym.h"
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+//#include "vc_mem.h"
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+
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+#define DRIVER_NAME "vc-cma"
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+
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+#define LOG_DBG(fmt, ...) \
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+ if (vc_cma_debug) \
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+ printk(KERN_INFO fmt "\n", ##__VA_ARGS__)
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+#define LOG_INFO(fmt, ...) \
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+ printk(KERN_INFO fmt "\n", ##__VA_ARGS__)
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+#define LOG_ERR(fmt, ...) \
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+ printk(KERN_ERR fmt "\n", ##__VA_ARGS__)
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+
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+#define VC_CMA_FOURCC VCHIQ_MAKE_FOURCC('C', 'M', 'A', ' ')
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+#define VC_CMA_VERSION 2
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+
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+#define VC_CMA_CHUNK_ORDER 6 /* 256K */
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+#define VC_CMA_CHUNK_SIZE (4096 << VC_CMA_CHUNK_ORDER)
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+#define VC_CMA_MAX_PARAMS_PER_MSG \
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+ ((VCHIQ_MAX_MSG_SIZE - sizeof(unsigned short))/sizeof(unsigned short))
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+#define VC_CMA_RESERVE_COUNT_MAX 16
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+
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+#define PAGES_PER_CHUNK (VC_CMA_CHUNK_SIZE / PAGE_SIZE)
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+
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+#define VCADDR_TO_PHYSADDR(vcaddr) (mm_vc_mem_phys_addr + vcaddr)
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+
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+#define loud_error(...) \
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+ LOG_ERR("===== " __VA_ARGS__)
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+
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+enum {
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+ VC_CMA_MSG_QUIT,
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+ VC_CMA_MSG_OPEN,
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+ VC_CMA_MSG_TICK,
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+ VC_CMA_MSG_ALLOC, /* chunk count */
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+ VC_CMA_MSG_FREE, /* chunk, chunk, ... */
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+ VC_CMA_MSG_ALLOCATED, /* chunk, chunk, ... */
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+ VC_CMA_MSG_REQUEST_ALLOC, /* chunk count */
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+ VC_CMA_MSG_REQUEST_FREE, /* chunk count */
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+ VC_CMA_MSG_RESERVE, /* bytes lo, bytes hi */
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+ VC_CMA_MSG_UPDATE_RESERVE,
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+ VC_CMA_MSG_MAX
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+};
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+
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+struct cma_msg {
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+ unsigned short type;
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+ unsigned short params[VC_CMA_MAX_PARAMS_PER_MSG];
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+};
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+
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+struct vc_cma_reserve_user {
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+ unsigned int pid;
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+ unsigned int reserve;
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+};
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+
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+/* Device (/dev) related variables */
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+static dev_t vc_cma_devnum;
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+static struct class *vc_cma_class;
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+static struct cdev vc_cma_cdev;
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+static int vc_cma_inited;
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+static int vc_cma_debug;
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+
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+/* Proc entry */
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+static struct proc_dir_entry *vc_cma_proc_entry;
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+
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+phys_addr_t vc_cma_base;
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+struct page *vc_cma_base_page;
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+unsigned int vc_cma_size;
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+EXPORT_SYMBOL(vc_cma_size);
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+unsigned int vc_cma_initial;
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+unsigned int vc_cma_chunks;
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+unsigned int vc_cma_chunks_used;
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+unsigned int vc_cma_chunks_reserved;
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+
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+
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+void *vc_cma_dma_alloc;
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+unsigned int vc_cma_dma_size;
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+
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+static int in_loud_error;
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+
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+unsigned int vc_cma_reserve_total;
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+unsigned int vc_cma_reserve_count;
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+struct vc_cma_reserve_user vc_cma_reserve_users[VC_CMA_RESERVE_COUNT_MAX];
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+static DEFINE_SEMAPHORE(vc_cma_reserve_mutex);
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+static DEFINE_SEMAPHORE(vc_cma_worker_queue_push_mutex);
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+
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+static u64 vc_cma_dma_mask = DMA_BIT_MASK(32);
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+static struct platform_device vc_cma_device = {
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+ .name = "vc-cma",
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+ .id = 0,
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+ .dev = {
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+ .dma_mask = &vc_cma_dma_mask,
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+ .coherent_dma_mask = DMA_BIT_MASK(32),
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+ },
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+};
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+
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+static VCHIQ_INSTANCE_T cma_instance;
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+static VCHIQ_SERVICE_HANDLE_T cma_service;
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+static VCHIU_QUEUE_T cma_msg_queue;
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+static struct task_struct *cma_worker;
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+
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+static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid);
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+static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply);
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+static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
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+ VCHIQ_HEADER_T * header,
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+ VCHIQ_SERVICE_HANDLE_T service,
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+ void *bulk_userdata);
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+static void send_vc_msg(unsigned short type,
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+ unsigned short param1, unsigned short param2);
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+static bool send_worker_msg(VCHIQ_HEADER_T * msg);
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+
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+static int early_vc_cma_mem(char *p)
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+{
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+ unsigned int new_size;
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+ printk(KERN_NOTICE "early_vc_cma_mem(%s)", p);
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+ vc_cma_size = memparse(p, &p);
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+ vc_cma_initial = vc_cma_size;
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+ if (*p == '/')
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+ vc_cma_size = memparse(p + 1, &p);
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+ if (*p == '@')
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+ vc_cma_base = memparse(p + 1, &p);
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+
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+ new_size = (vc_cma_size - ((-vc_cma_base) & (VC_CMA_CHUNK_SIZE - 1)))
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+ & ~(VC_CMA_CHUNK_SIZE - 1);
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+ if (new_size > vc_cma_size)
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+ vc_cma_size = 0;
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+ vc_cma_initial = (vc_cma_initial + VC_CMA_CHUNK_SIZE - 1)
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+ & ~(VC_CMA_CHUNK_SIZE - 1);
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+ if (vc_cma_initial > vc_cma_size)
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+ vc_cma_initial = vc_cma_size;
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+ vc_cma_base = (vc_cma_base + VC_CMA_CHUNK_SIZE - 1)
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+ & ~(VC_CMA_CHUNK_SIZE - 1);
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+
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+ printk(KERN_NOTICE " -> initial %x, size %x, base %x", vc_cma_initial,
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+ vc_cma_size, (unsigned int)vc_cma_base);
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+
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+ return 0;
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+}
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+
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+early_param("vc-cma-mem", early_vc_cma_mem);
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+
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+void vc_cma_early_init(void)
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+{
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+ LOG_DBG("vc_cma_early_init - vc_cma_chunks = %d", vc_cma_chunks);
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+ if (vc_cma_size) {
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+ int rc = platform_device_register(&vc_cma_device);
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+ LOG_DBG("platform_device_register -> %d", rc);
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+ }
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+}
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+
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+void vc_cma_reserve(void)
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+{
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+ /* if vc_cma_size is set, then declare vc CMA area of the same
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+ * size from the end of memory
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+ */
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+ if (vc_cma_size) {
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+ if (dma_declare_contiguous(&vc_cma_device.dev, vc_cma_size,
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+ vc_cma_base, 0) == 0) {
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+ if (!dev_get_cma_area(NULL)) {
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+ /* There is no default CMA area - make this
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+ the default */
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+ struct cma *vc_cma_area = dev_get_cma_area(
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+ &vc_cma_device.dev);
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+ dma_contiguous_set_default(vc_cma_area);
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+ LOG_INFO("vc_cma_reserve - using vc_cma as "
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+ "the default contiguous DMA area");
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+ }
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+ } else {
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+ LOG_ERR("vc_cma: dma_declare_contiguous(%x,%x) failed",
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+ vc_cma_size, (unsigned int)vc_cma_base);
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+ vc_cma_size = 0;
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+ }
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+ }
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+ vc_cma_chunks = vc_cma_size / VC_CMA_CHUNK_SIZE;
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+}
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+
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+/****************************************************************************
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+*
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+* vc_cma_open
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+*
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+***************************************************************************/
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+
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+static int vc_cma_open(struct inode *inode, struct file *file)
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+{
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+ (void)inode;
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+ (void)file;
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+
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+ return 0;
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+}
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+
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+/****************************************************************************
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+*
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+* vc_cma_release
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+*
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+***************************************************************************/
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+
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+static int vc_cma_release(struct inode *inode, struct file *file)
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+{
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+ (void)inode;
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+ (void)file;
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+
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+ vc_cma_set_reserve(0, current->tgid);
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+
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+ return 0;
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+}
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+
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+/****************************************************************************
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+*
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+* vc_cma_ioctl
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+*
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+***************************************************************************/
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+
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+static long vc_cma_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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+{
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+ int rc = 0;
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+
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+ (void)cmd;
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+ (void)arg;
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+
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+ switch (cmd) {
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+ case VC_CMA_IOC_RESERVE:
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+ rc = vc_cma_set_reserve((unsigned int)arg, current->tgid);
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+ if (rc >= 0)
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+ rc = 0;
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+ break;
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+ default:
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+ LOG_ERR("vc-cma: Unknown ioctl %x", cmd);
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+ return -ENOTTY;
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+ }
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+
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+ return rc;
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+}
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+
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+/****************************************************************************
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+*
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+* File Operations for the driver.
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+*
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+***************************************************************************/
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+
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+static const struct file_operations vc_cma_fops = {
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+ .owner = THIS_MODULE,
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+ .open = vc_cma_open,
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+ .release = vc_cma_release,
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+ .unlocked_ioctl = vc_cma_ioctl,
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+};
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+
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+/****************************************************************************
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+*
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+* vc_cma_proc_open
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+*
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+***************************************************************************/
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+
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+static int vc_cma_show_info(struct seq_file *m, void *v)
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+{
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+ int i;
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+
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+ seq_printf(m, "Videocore CMA:\n");
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+ seq_printf(m, " Base : %08x\n", (unsigned int)vc_cma_base);
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+ seq_printf(m, " Length : %08x\n", vc_cma_size);
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+ seq_printf(m, " Initial : %08x\n", vc_cma_initial);
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+ seq_printf(m, " Chunk size : %08x\n", VC_CMA_CHUNK_SIZE);
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+ seq_printf(m, " Chunks : %4d (%d bytes)\n",
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+ (int)vc_cma_chunks,
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+ (int)(vc_cma_chunks * VC_CMA_CHUNK_SIZE));
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+ seq_printf(m, " Used : %4d (%d bytes)\n",
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+ (int)vc_cma_chunks_used,
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+ (int)(vc_cma_chunks_used * VC_CMA_CHUNK_SIZE));
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+ seq_printf(m, " Reserved : %4d (%d bytes)\n",
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+ (unsigned int)vc_cma_chunks_reserved,
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+ (int)(vc_cma_chunks_reserved * VC_CMA_CHUNK_SIZE));
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+
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+ for (i = 0; i < vc_cma_reserve_count; i++) {
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+ struct vc_cma_reserve_user *user = &vc_cma_reserve_users[i];
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+ seq_printf(m, " PID %5d: %d bytes\n", user->pid,
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+ user->reserve);
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+ }
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+ seq_printf(m, " dma_alloc : %p (%d pages)\n",
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+ vc_cma_dma_alloc ? page_address(vc_cma_dma_alloc) : 0,
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+ vc_cma_dma_size);
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+
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+ seq_printf(m, "\n");
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+
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+ return 0;
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+}
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+
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+static int vc_cma_proc_open(struct inode *inode, struct file *file)
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+{
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+ return single_open(file, vc_cma_show_info, NULL);
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+}
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+
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+/****************************************************************************
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+*
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+* vc_cma_proc_write
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+*
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+***************************************************************************/
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+
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+static int vc_cma_proc_write(struct file *file,
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+ const char __user *buffer,
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+ size_t size, loff_t *ppos)
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+{
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+ int rc = -EFAULT;
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+ char input_str[20];
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+
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+ memset(input_str, 0, sizeof(input_str));
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+
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+ if (size > sizeof(input_str)) {
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+ LOG_ERR("%s: input string length too long", __func__);
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|
+ goto out;
|
|
+ }
|
|
+
|
|
+ if (copy_from_user(input_str, buffer, size - 1)) {
|
|
+ LOG_ERR("%s: failed to get input string", __func__);
|
|
+ goto out;
|
|
+ }
|
|
+#define ALLOC_STR "alloc"
|
|
+#define FREE_STR "free"
|
|
+#define DEBUG_STR "debug"
|
|
+#define RESERVE_STR "reserve"
|
|
+#define DMA_ALLOC_STR "dma_alloc"
|
|
+#define DMA_FREE_STR "dma_free"
|
|
+ if (strncmp(input_str, ALLOC_STR, strlen(ALLOC_STR)) == 0) {
|
|
+ int alloc_size;
|
|
+ char *p = input_str + strlen(ALLOC_STR);
|
|
+
|
|
+ while (*p == ' ')
|
|
+ p++;
|
|
+ alloc_size = memparse(p, NULL);
|
|
+ LOG_INFO("/proc/vc-cma: alloc %d", alloc_size);
|
|
+ if (alloc_size)
|
|
+ send_vc_msg(VC_CMA_MSG_REQUEST_FREE,
|
|
+ alloc_size / VC_CMA_CHUNK_SIZE, 0);
|
|
+ else
|
|
+ LOG_ERR("invalid size '%s'", p);
|
|
+ rc = size;
|
|
+ } else if (strncmp(input_str, FREE_STR, strlen(FREE_STR)) == 0) {
|
|
+ int alloc_size;
|
|
+ char *p = input_str + strlen(FREE_STR);
|
|
+
|
|
+ while (*p == ' ')
|
|
+ p++;
|
|
+ alloc_size = memparse(p, NULL);
|
|
+ LOG_INFO("/proc/vc-cma: free %d", alloc_size);
|
|
+ if (alloc_size)
|
|
+ send_vc_msg(VC_CMA_MSG_REQUEST_ALLOC,
|
|
+ alloc_size / VC_CMA_CHUNK_SIZE, 0);
|
|
+ else
|
|
+ LOG_ERR("invalid size '%s'", p);
|
|
+ rc = size;
|
|
+ } else if (strncmp(input_str, DEBUG_STR, strlen(DEBUG_STR)) == 0) {
|
|
+ char *p = input_str + strlen(DEBUG_STR);
|
|
+ while (*p == ' ')
|
|
+ p++;
|
|
+ if ((strcmp(p, "on") == 0) || (strcmp(p, "1") == 0))
|
|
+ vc_cma_debug = 1;
|
|
+ else if ((strcmp(p, "off") == 0) || (strcmp(p, "0") == 0))
|
|
+ vc_cma_debug = 0;
|
|
+ LOG_INFO("/proc/vc-cma: debug %s", vc_cma_debug ? "on" : "off");
|
|
+ rc = size;
|
|
+ } else if (strncmp(input_str, RESERVE_STR, strlen(RESERVE_STR)) == 0) {
|
|
+ int alloc_size;
|
|
+ int reserved;
|
|
+ char *p = input_str + strlen(RESERVE_STR);
|
|
+ while (*p == ' ')
|
|
+ p++;
|
|
+ alloc_size = memparse(p, NULL);
|
|
+
|
|
+ reserved = vc_cma_set_reserve(alloc_size, current->tgid);
|
|
+ rc = (reserved >= 0) ? size : reserved;
|
|
+ } else if (strncmp(input_str, DMA_ALLOC_STR, strlen(DMA_ALLOC_STR)) == 0) {
|
|
+ int alloc_size;
|
|
+ char *p = input_str + strlen(DMA_ALLOC_STR);
|
|
+ while (*p == ' ')
|
|
+ p++;
|
|
+ alloc_size = memparse(p, NULL);
|
|
+
|
|
+ if (vc_cma_dma_alloc) {
|
|
+ dma_release_from_contiguous(NULL, vc_cma_dma_alloc,
|
|
+ vc_cma_dma_size);
|
|
+ vc_cma_dma_alloc = NULL;
|
|
+ vc_cma_dma_size = 0;
|
|
+ }
|
|
+ vc_cma_dma_alloc = dma_alloc_from_contiguous(NULL, alloc_size, 0);
|
|
+ vc_cma_dma_size = (vc_cma_dma_alloc ? alloc_size : 0);
|
|
+ if (vc_cma_dma_alloc)
|
|
+ LOG_INFO("dma_alloc(%d pages) -> %p", alloc_size, page_address(vc_cma_dma_alloc));
|
|
+ else
|
|
+ LOG_ERR("dma_alloc(%d pages) failed", alloc_size);
|
|
+ rc = size;
|
|
+ } else if (strncmp(input_str, DMA_FREE_STR, strlen(DMA_FREE_STR)) == 0) {
|
|
+ if (vc_cma_dma_alloc) {
|
|
+ dma_release_from_contiguous(NULL, vc_cma_dma_alloc,
|
|
+ vc_cma_dma_size);
|
|
+ vc_cma_dma_alloc = NULL;
|
|
+ vc_cma_dma_size = 0;
|
|
+ }
|
|
+ rc = size;
|
|
+ }
|
|
+
|
|
+out:
|
|
+ return rc;
|
|
+}
|
|
+
|
|
+/****************************************************************************
|
|
+*
|
|
+* File Operations for /proc interface.
|
|
+*
|
|
+***************************************************************************/
|
|
+
|
|
+static const struct file_operations vc_cma_proc_fops = {
|
|
+ .open = vc_cma_proc_open,
|
|
+ .read = seq_read,
|
|
+ .write = vc_cma_proc_write,
|
|
+ .llseek = seq_lseek,
|
|
+ .release = single_release
|
|
+};
|
|
+
|
|
+static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid)
|
|
+{
|
|
+ struct vc_cma_reserve_user *user = NULL;
|
|
+ int delta = 0;
|
|
+ int i;
|
|
+
|
|
+ if (down_interruptible(&vc_cma_reserve_mutex))
|
|
+ return -ERESTARTSYS;
|
|
+
|
|
+ for (i = 0; i < vc_cma_reserve_count; i++) {
|
|
+ if (pid == vc_cma_reserve_users[i].pid) {
|
|
+ user = &vc_cma_reserve_users[i];
|
|
+ delta = reserve - user->reserve;
|
|
+ if (reserve)
|
|
+ user->reserve = reserve;
|
|
+ else {
|
|
+ /* Remove this entry by copying downwards */
|
|
+ while ((i + 1) < vc_cma_reserve_count) {
|
|
+ user[0].pid = user[1].pid;
|
|
+ user[0].reserve = user[1].reserve;
|
|
+ user++;
|
|
+ i++;
|
|
+ }
|
|
+ vc_cma_reserve_count--;
|
|
+ user = NULL;
|
|
+ }
|
|
+ break;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ if (reserve && !user) {
|
|
+ if (vc_cma_reserve_count == VC_CMA_RESERVE_COUNT_MAX) {
|
|
+ LOG_ERR("vc-cma: Too many reservations - "
|
|
+ "increase CMA_RESERVE_COUNT_MAX");
|
|
+ up(&vc_cma_reserve_mutex);
|
|
+ return -EBUSY;
|
|
+ }
|
|
+ user = &vc_cma_reserve_users[vc_cma_reserve_count];
|
|
+ user->pid = pid;
|
|
+ user->reserve = reserve;
|
|
+ delta = reserve;
|
|
+ vc_cma_reserve_count++;
|
|
+ }
|
|
+
|
|
+ vc_cma_reserve_total += delta;
|
|
+
|
|
+ send_vc_msg(VC_CMA_MSG_RESERVE,
|
|
+ vc_cma_reserve_total & 0xffff, vc_cma_reserve_total >> 16);
|
|
+
|
|
+ send_worker_msg((VCHIQ_HEADER_T *) VC_CMA_MSG_UPDATE_RESERVE);
|
|
+
|
|
+ LOG_DBG("/proc/vc-cma: reserve %d (PID %d) - total %u",
|
|
+ reserve, pid, vc_cma_reserve_total);
|
|
+
|
|
+ up(&vc_cma_reserve_mutex);
|
|
+
|
|
+ return vc_cma_reserve_total;
|
|
+}
|
|
+
|
|
+static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
|
|
+ VCHIQ_HEADER_T * header,
|
|
+ VCHIQ_SERVICE_HANDLE_T service,
|
|
+ void *bulk_userdata)
|
|
+{
|
|
+ switch (reason) {
|
|
+ case VCHIQ_MESSAGE_AVAILABLE:
|
|
+ if (!send_worker_msg(header))
|
|
+ return VCHIQ_RETRY;
|
|
+ break;
|
|
+ case VCHIQ_SERVICE_CLOSED:
|
|
+ LOG_DBG("CMA service closed");
|
|
+ break;
|
|
+ default:
|
|
+ LOG_ERR("Unexpected CMA callback reason %d", reason);
|
|
+ break;
|
|
+ }
|
|
+ return VCHIQ_SUCCESS;
|
|
+}
|
|
+
|
|
+static void send_vc_msg(unsigned short type,
|
|
+ unsigned short param1, unsigned short param2)
|
|
+{
|
|
+ unsigned short msg[] = { type, param1, param2 };
|
|
+ VCHIQ_ELEMENT_T elem = { &msg, sizeof(msg) };
|
|
+ VCHIQ_STATUS_T ret;
|
|
+ vchiq_use_service(cma_service);
|
|
+ ret = vchiq_queue_message(cma_service, &elem, 1);
|
|
+ vchiq_release_service(cma_service);
|
|
+ if (ret != VCHIQ_SUCCESS)
|
|
+ LOG_ERR("vchiq_queue_message returned %x", ret);
|
|
+}
|
|
+
|
|
+static bool send_worker_msg(VCHIQ_HEADER_T * msg)
|
|
+{
|
|
+ if (down_interruptible(&vc_cma_worker_queue_push_mutex))
|
|
+ return false;
|
|
+ vchiu_queue_push(&cma_msg_queue, msg);
|
|
+ up(&vc_cma_worker_queue_push_mutex);
|
|
+ return true;
|
|
+}
|
|
+
|
|
+static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply)
|
|
+{
|
|
+ int i;
|
|
+ for (i = 0; i < num_chunks; i++) {
|
|
+ struct page *chunk;
|
|
+ unsigned int chunk_num;
|
|
+ uint8_t *chunk_addr;
|
|
+ size_t chunk_size = PAGES_PER_CHUNK << PAGE_SHIFT;
|
|
+
|
|
+ chunk = dma_alloc_from_contiguous(&vc_cma_device.dev,
|
|
+ PAGES_PER_CHUNK,
|
|
+ VC_CMA_CHUNK_ORDER);
|
|
+ if (!chunk)
|
|
+ break;
|
|
+
|
|
+ chunk_addr = page_address(chunk);
|
|
+ dmac_flush_range(chunk_addr, chunk_addr + chunk_size);
|
|
+ outer_inv_range(__pa(chunk_addr), __pa(chunk_addr) +
|
|
+ chunk_size);
|
|
+
|
|
+ chunk_num =
|
|
+ (page_to_phys(chunk) - vc_cma_base) / VC_CMA_CHUNK_SIZE;
|
|
+ BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
|
|
+ VC_CMA_CHUNK_SIZE) != 0);
|
|
+ if (chunk_num >= vc_cma_chunks) {
|
|
+ phys_addr_t _pa = vc_cma_base + vc_cma_size - 1;
|
|
+ LOG_ERR("%s: ===============================",
|
|
+ __func__);
|
|
+ LOG_ERR("%s: chunk phys %x, vc_cma %pa-%pa - "
|
|
+ "bad SPARSEMEM configuration?",
|
|
+ __func__, (unsigned int)page_to_phys(chunk),
|
|
+ &vc_cma_base, &_pa);
|
|
+ LOG_ERR("%s: dev->cma_area = %p", __func__,
|
|
+ (void*)0/*vc_cma_device.dev.cma_area*/);
|
|
+ LOG_ERR("%s: ===============================",
|
|
+ __func__);
|
|
+ break;
|
|
+ }
|
|
+ reply->params[i] = chunk_num;
|
|
+ vc_cma_chunks_used++;
|
|
+ }
|
|
+
|
|
+ if (i < num_chunks) {
|
|
+ LOG_ERR("%s: dma_alloc_from_contiguous failed "
|
|
+ "for %x bytes (alloc %d of %d, %d free)",
|
|
+ __func__, VC_CMA_CHUNK_SIZE, i,
|
|
+ num_chunks, vc_cma_chunks - vc_cma_chunks_used);
|
|
+ num_chunks = i;
|
|
+ }
|
|
+
|
|
+ LOG_DBG("CMA allocated %d chunks -> %d used",
|
|
+ num_chunks, vc_cma_chunks_used);
|
|
+ reply->type = VC_CMA_MSG_ALLOCATED;
|
|
+
|
|
+ {
|
|
+ VCHIQ_ELEMENT_T elem = {
|
|
+ reply,
|
|
+ offsetof(struct cma_msg, params[0]) +
|
|
+ num_chunks * sizeof(reply->params[0])
|
|
+ };
|
|
+ VCHIQ_STATUS_T ret;
|
|
+ vchiq_use_service(cma_service);
|
|
+ ret = vchiq_queue_message(cma_service, &elem, 1);
|
|
+ vchiq_release_service(cma_service);
|
|
+ if (ret != VCHIQ_SUCCESS)
|
|
+ LOG_ERR("vchiq_queue_message return " "%x", ret);
|
|
+ }
|
|
+
|
|
+ return num_chunks;
|
|
+}
|
|
+
|
|
+static int cma_worker_proc(void *param)
|
|
+{
|
|
+ static struct cma_msg reply;
|
|
+ (void)param;
|
|
+
|
|
+ while (1) {
|
|
+ VCHIQ_HEADER_T *msg;
|
|
+ static struct cma_msg msg_copy;
|
|
+ struct cma_msg *cma_msg = &msg_copy;
|
|
+ int type, msg_size;
|
|
+
|
|
+ msg = vchiu_queue_pop(&cma_msg_queue);
|
|
+ if ((unsigned int)msg >= VC_CMA_MSG_MAX) {
|
|
+ msg_size = msg->size;
|
|
+ memcpy(&msg_copy, msg->data, msg_size);
|
|
+ type = cma_msg->type;
|
|
+ vchiq_release_message(cma_service, msg);
|
|
+ } else {
|
|
+ msg_size = 0;
|
|
+ type = (int)msg;
|
|
+ if (type == VC_CMA_MSG_QUIT)
|
|
+ break;
|
|
+ else if (type == VC_CMA_MSG_UPDATE_RESERVE) {
|
|
+ msg = NULL;
|
|
+ cma_msg = NULL;
|
|
+ } else {
|
|
+ BUG();
|
|
+ continue;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ switch (type) {
|
|
+ case VC_CMA_MSG_ALLOC:{
|
|
+ int num_chunks, free_chunks;
|
|
+ num_chunks = cma_msg->params[0];
|
|
+ free_chunks =
|
|
+ vc_cma_chunks - vc_cma_chunks_used;
|
|
+ LOG_DBG("CMA_MSG_ALLOC(%d chunks)", num_chunks);
|
|
+ if (num_chunks > VC_CMA_MAX_PARAMS_PER_MSG) {
|
|
+ LOG_ERR
|
|
+ ("CMA_MSG_ALLOC - chunk count (%d) "
|
|
+ "exceeds VC_CMA_MAX_PARAMS_PER_MSG (%d)",
|
|
+ num_chunks,
|
|
+ VC_CMA_MAX_PARAMS_PER_MSG);
|
|
+ num_chunks = VC_CMA_MAX_PARAMS_PER_MSG;
|
|
+ }
|
|
+
|
|
+ if (num_chunks > free_chunks) {
|
|
+ LOG_ERR
|
|
+ ("CMA_MSG_ALLOC - chunk count (%d) "
|
|
+ "exceeds free chunks (%d)",
|
|
+ num_chunks, free_chunks);
|
|
+ num_chunks = free_chunks;
|
|
+ }
|
|
+
|
|
+ vc_cma_alloc_chunks(num_chunks, &reply);
|
|
+ }
|
|
+ break;
|
|
+
|
|
+ case VC_CMA_MSG_FREE:{
|
|
+ int chunk_count =
|
|
+ (msg_size -
|
|
+ offsetof(struct cma_msg,
|
|
+ params)) /
|
|
+ sizeof(cma_msg->params[0]);
|
|
+ int i;
|
|
+ BUG_ON(chunk_count <= 0);
|
|
+
|
|
+ LOG_DBG("CMA_MSG_FREE(%d chunks - %x, ...)",
|
|
+ chunk_count, cma_msg->params[0]);
|
|
+ for (i = 0; i < chunk_count; i++) {
|
|
+ int chunk_num = cma_msg->params[i];
|
|
+ struct page *page = vc_cma_base_page +
|
|
+ chunk_num * PAGES_PER_CHUNK;
|
|
+ if (chunk_num >= vc_cma_chunks) {
|
|
+ LOG_ERR
|
|
+ ("CMA_MSG_FREE - chunk %d of %d"
|
|
+ " (value %x) exceeds maximum "
|
|
+ "(%x)", i, chunk_count,
|
|
+ chunk_num,
|
|
+ vc_cma_chunks - 1);
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ if (!dma_release_from_contiguous
|
|
+ (&vc_cma_device.dev, page,
|
|
+ PAGES_PER_CHUNK)) {
|
|
+ phys_addr_t _pa = page_to_phys(page);
|
|
+ LOG_ERR
|
|
+ ("CMA_MSG_FREE - failed to "
|
|
+ "release chunk %d (phys %pa, "
|
|
+ "page %x)", chunk_num,
|
|
+ &_pa,
|
|
+ (unsigned int)page);
|
|
+ }
|
|
+ vc_cma_chunks_used--;
|
|
+ }
|
|
+ LOG_DBG("CMA released %d chunks -> %d used",
|
|
+ i, vc_cma_chunks_used);
|
|
+ }
|
|
+ break;
|
|
+
|
|
+ case VC_CMA_MSG_UPDATE_RESERVE:{
|
|
+ int chunks_needed =
|
|
+ ((vc_cma_reserve_total + VC_CMA_CHUNK_SIZE -
|
|
+ 1)
|
|
+ / VC_CMA_CHUNK_SIZE) -
|
|
+ vc_cma_chunks_reserved;
|
|
+
|
|
+ LOG_DBG
|
|
+ ("CMA_MSG_UPDATE_RESERVE(%d chunks needed)",
|
|
+ chunks_needed);
|
|
+
|
|
+ /* Cap the reservations to what is available */
|
|
+ if (chunks_needed > 0) {
|
|
+ if (chunks_needed >
|
|
+ (vc_cma_chunks -
|
|
+ vc_cma_chunks_used))
|
|
+ chunks_needed =
|
|
+ (vc_cma_chunks -
|
|
+ vc_cma_chunks_used);
|
|
+
|
|
+ chunks_needed =
|
|
+ vc_cma_alloc_chunks(chunks_needed,
|
|
+ &reply);
|
|
+ }
|
|
+
|
|
+ LOG_DBG
|
|
+ ("CMA_MSG_UPDATE_RESERVE(%d chunks allocated)",
|
|
+ chunks_needed);
|
|
+ vc_cma_chunks_reserved += chunks_needed;
|
|
+ }
|
|
+ break;
|
|
+
|
|
+ default:
|
|
+ LOG_ERR("unexpected msg type %d", type);
|
|
+ break;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ LOG_DBG("quitting...");
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/****************************************************************************
|
|
+*
|
|
+* vc_cma_connected_init
|
|
+*
|
|
+* This function is called once the videocore has been connected.
|
|
+*
|
|
+***************************************************************************/
|
|
+
|
|
+static void vc_cma_connected_init(void)
|
|
+{
|
|
+ VCHIQ_SERVICE_PARAMS_T service_params;
|
|
+
|
|
+ LOG_DBG("vc_cma_connected_init");
|
|
+
|
|
+ if (!vchiu_queue_init(&cma_msg_queue, 16)) {
|
|
+ LOG_ERR("could not create CMA msg queue");
|
|
+ goto fail_queue;
|
|
+ }
|
|
+
|
|
+ if (vchiq_initialise(&cma_instance) != VCHIQ_SUCCESS)
|
|
+ goto fail_vchiq_init;
|
|
+
|
|
+ vchiq_connect(cma_instance);
|
|
+
|
|
+ service_params.fourcc = VC_CMA_FOURCC;
|
|
+ service_params.callback = cma_service_callback;
|
|
+ service_params.userdata = NULL;
|
|
+ service_params.version = VC_CMA_VERSION;
|
|
+ service_params.version_min = VC_CMA_VERSION;
|
|
+
|
|
+ if (vchiq_open_service(cma_instance, &service_params,
|
|
+ &cma_service) != VCHIQ_SUCCESS) {
|
|
+ LOG_ERR("failed to open service - already in use?");
|
|
+ goto fail_vchiq_open;
|
|
+ }
|
|
+
|
|
+ vchiq_release_service(cma_service);
|
|
+
|
|
+ cma_worker = kthread_create(cma_worker_proc, NULL, "cma_worker");
|
|
+ if (!cma_worker) {
|
|
+ LOG_ERR("could not create CMA worker thread");
|
|
+ goto fail_worker;
|
|
+ }
|
|
+ set_user_nice(cma_worker, -20);
|
|
+ wake_up_process(cma_worker);
|
|
+
|
|
+ return;
|
|
+
|
|
+fail_worker:
|
|
+ vchiq_close_service(cma_service);
|
|
+fail_vchiq_open:
|
|
+ vchiq_shutdown(cma_instance);
|
|
+fail_vchiq_init:
|
|
+ vchiu_queue_delete(&cma_msg_queue);
|
|
+fail_queue:
|
|
+ return;
|
|
+}
|
|
+
|
|
+void
|
|
+loud_error_header(void)
|
|
+{
|
|
+ if (in_loud_error)
|
|
+ return;
|
|
+
|
|
+ LOG_ERR("============================================================"
|
|
+ "================");
|
|
+ LOG_ERR("============================================================"
|
|
+ "================");
|
|
+ LOG_ERR("=====");
|
|
+
|
|
+ in_loud_error = 1;
|
|
+}
|
|
+
|
|
+void
|
|
+loud_error_footer(void)
|
|
+{
|
|
+ if (!in_loud_error)
|
|
+ return;
|
|
+
|
|
+ LOG_ERR("=====");
|
|
+ LOG_ERR("============================================================"
|
|
+ "================");
|
|
+ LOG_ERR("============================================================"
|
|
+ "================");
|
|
+
|
|
+ in_loud_error = 0;
|
|
+}
|
|
+
|
|
+#if 1
|
|
+static int check_cma_config(void) { return 1; }
|
|
+#else
|
|
+static int
|
|
+read_vc_debug_var(VC_MEM_ACCESS_HANDLE_T handle,
|
|
+ const char *symbol,
|
|
+ void *buf, size_t bufsize)
|
|
+{
|
|
+ VC_MEM_ADDR_T vcMemAddr;
|
|
+ size_t vcMemSize;
|
|
+ uint8_t *mapAddr;
|
|
+ off_t vcMapAddr;
|
|
+
|
|
+ if (!LookupVideoCoreSymbol(handle, symbol,
|
|
+ &vcMemAddr,
|
|
+ &vcMemSize)) {
|
|
+ loud_error_header();
|
|
+ loud_error(
|
|
+ "failed to find VC symbol \"%s\".",
|
|
+ symbol);
|
|
+ loud_error_footer();
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ if (vcMemSize != bufsize) {
|
|
+ loud_error_header();
|
|
+ loud_error(
|
|
+ "VC symbol \"%s\" is the wrong size.",
|
|
+ symbol);
|
|
+ loud_error_footer();
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ vcMapAddr = (off_t)vcMemAddr & VC_MEM_TO_ARM_ADDR_MASK;
|
|
+ vcMapAddr += mm_vc_mem_phys_addr;
|
|
+ mapAddr = ioremap_nocache(vcMapAddr, vcMemSize);
|
|
+ if (mapAddr == 0) {
|
|
+ loud_error_header();
|
|
+ loud_error(
|
|
+ "failed to ioremap \"%s\" @ 0x%x "
|
|
+ "(phys: 0x%x, size: %u).",
|
|
+ symbol,
|
|
+ (unsigned int)vcMapAddr,
|
|
+ (unsigned int)vcMemAddr,
|
|
+ (unsigned int)vcMemSize);
|
|
+ loud_error_footer();
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ memcpy(buf, mapAddr, bufsize);
|
|
+ iounmap(mapAddr);
|
|
+
|
|
+ return 1;
|
|
+}
|
|
+
|
|
+
|
|
+static int
|
|
+check_cma_config(void)
|
|
+{
|
|
+ VC_MEM_ACCESS_HANDLE_T mem_hndl;
|
|
+ VC_MEM_ADDR_T mempool_start;
|
|
+ VC_MEM_ADDR_T mempool_end;
|
|
+ VC_MEM_ADDR_T mempool_offline_start;
|
|
+ VC_MEM_ADDR_T mempool_offline_end;
|
|
+ VC_MEM_ADDR_T cam_alloc_base;
|
|
+ VC_MEM_ADDR_T cam_alloc_size;
|
|
+ VC_MEM_ADDR_T cam_alloc_end;
|
|
+ int success = 0;
|
|
+
|
|
+ if (OpenVideoCoreMemory(&mem_hndl) != 0)
|
|
+ goto out;
|
|
+
|
|
+ /* Read the relevant VideoCore variables */
|
|
+ if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_START",
|
|
+ &mempool_start,
|
|
+ sizeof(mempool_start)))
|
|
+ goto close;
|
|
+
|
|
+ if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_END",
|
|
+ &mempool_end,
|
|
+ sizeof(mempool_end)))
|
|
+ goto close;
|
|
+
|
|
+ if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_START",
|
|
+ &mempool_offline_start,
|
|
+ sizeof(mempool_offline_start)))
|
|
+ goto close;
|
|
+
|
|
+ if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_END",
|
|
+ &mempool_offline_end,
|
|
+ sizeof(mempool_offline_end)))
|
|
+ goto close;
|
|
+
|
|
+ if (!read_vc_debug_var(mem_hndl, "cam_alloc_base",
|
|
+ &cam_alloc_base,
|
|
+ sizeof(cam_alloc_base)))
|
|
+ goto close;
|
|
+
|
|
+ if (!read_vc_debug_var(mem_hndl, "cam_alloc_size",
|
|
+ &cam_alloc_size,
|
|
+ sizeof(cam_alloc_size)))
|
|
+ goto close;
|
|
+
|
|
+ cam_alloc_end = cam_alloc_base + cam_alloc_size;
|
|
+
|
|
+ success = 1;
|
|
+
|
|
+ /* Now the sanity checks */
|
|
+ if (!mempool_offline_start)
|
|
+ mempool_offline_start = mempool_start;
|
|
+ if (!mempool_offline_end)
|
|
+ mempool_offline_end = mempool_end;
|
|
+
|
|
+ if (VCADDR_TO_PHYSADDR(mempool_offline_start) != vc_cma_base) {
|
|
+ loud_error_header();
|
|
+ loud_error(
|
|
+ "__MEMPOOL_OFFLINE_START(%x -> %lx) doesn't match "
|
|
+ "vc_cma_base(%x)",
|
|
+ mempool_offline_start,
|
|
+ VCADDR_TO_PHYSADDR(mempool_offline_start),
|
|
+ vc_cma_base);
|
|
+ success = 0;
|
|
+ }
|
|
+
|
|
+ if (VCADDR_TO_PHYSADDR(mempool_offline_end) !=
|
|
+ (vc_cma_base + vc_cma_size)) {
|
|
+ loud_error_header();
|
|
+ loud_error(
|
|
+ "__MEMPOOL_OFFLINE_END(%x -> %lx) doesn't match "
|
|
+ "vc_cma_base(%x) + vc_cma_size(%x) = %x",
|
|
+ mempool_offline_start,
|
|
+ VCADDR_TO_PHYSADDR(mempool_offline_end),
|
|
+ vc_cma_base, vc_cma_size, vc_cma_base + vc_cma_size);
|
|
+ success = 0;
|
|
+ }
|
|
+
|
|
+ if (mempool_end < mempool_start) {
|
|
+ loud_error_header();
|
|
+ loud_error(
|
|
+ "__MEMPOOL_END(%x) must not be before "
|
|
+ "__MEMPOOL_START(%x)",
|
|
+ mempool_end,
|
|
+ mempool_start);
|
|
+ success = 0;
|
|
+ }
|
|
+
|
|
+ if (mempool_offline_end < mempool_offline_start) {
|
|
+ loud_error_header();
|
|
+ loud_error(
|
|
+ "__MEMPOOL_OFFLINE_END(%x) must not be before "
|
|
+ "__MEMPOOL_OFFLINE_START(%x)",
|
|
+ mempool_offline_end,
|
|
+ mempool_offline_start);
|
|
+ success = 0;
|
|
+ }
|
|
+
|
|
+ if (mempool_offline_start < mempool_start) {
|
|
+ loud_error_header();
|
|
+ loud_error(
|
|
+ "__MEMPOOL_OFFLINE_START(%x) must not be before "
|
|
+ "__MEMPOOL_START(%x)",
|
|
+ mempool_offline_start,
|
|
+ mempool_start);
|
|
+ success = 0;
|
|
+ }
|
|
+
|
|
+ if (mempool_offline_end > mempool_end) {
|
|
+ loud_error_header();
|
|
+ loud_error(
|
|
+ "__MEMPOOL_OFFLINE_END(%x) must not be after "
|
|
+ "__MEMPOOL_END(%x)",
|
|
+ mempool_offline_end,
|
|
+ mempool_end);
|
|
+ success = 0;
|
|
+ }
|
|
+
|
|
+ if ((cam_alloc_base < mempool_end) &&
|
|
+ (cam_alloc_end > mempool_start)) {
|
|
+ loud_error_header();
|
|
+ loud_error(
|
|
+ "cam_alloc pool(%x-%x) overlaps "
|
|
+ "mempool(%x-%x)",
|
|
+ cam_alloc_base, cam_alloc_end,
|
|
+ mempool_start, mempool_end);
|
|
+ success = 0;
|
|
+ }
|
|
+
|
|
+ loud_error_footer();
|
|
+
|
|
+close:
|
|
+ CloseVideoCoreMemory(mem_hndl);
|
|
+
|
|
+out:
|
|
+ return success;
|
|
+}
|
|
+#endif
|
|
+
|
|
+static int vc_cma_init(void)
|
|
+{
|
|
+ int rc = -EFAULT;
|
|
+ struct device *dev;
|
|
+
|
|
+ if (!check_cma_config())
|
|
+ goto out_release;
|
|
+
|
|
+ LOG_INFO("vc-cma: Videocore CMA driver");
|
|
+ LOG_INFO("vc-cma: vc_cma_base = %pa", &vc_cma_base);
|
|
+ LOG_INFO("vc-cma: vc_cma_size = 0x%08x (%u MiB)",
|
|
+ vc_cma_size, vc_cma_size / (1024 * 1024));
|
|
+ LOG_INFO("vc-cma: vc_cma_initial = 0x%08x (%u MiB)",
|
|
+ vc_cma_initial, vc_cma_initial / (1024 * 1024));
|
|
+
|
|
+ vc_cma_base_page = phys_to_page(vc_cma_base);
|
|
+
|
|
+ if (vc_cma_chunks) {
|
|
+ int chunks_needed = vc_cma_initial / VC_CMA_CHUNK_SIZE;
|
|
+
|
|
+ for (vc_cma_chunks_used = 0;
|
|
+ vc_cma_chunks_used < chunks_needed; vc_cma_chunks_used++) {
|
|
+ struct page *chunk;
|
|
+ chunk = dma_alloc_from_contiguous(&vc_cma_device.dev,
|
|
+ PAGES_PER_CHUNK,
|
|
+ VC_CMA_CHUNK_ORDER);
|
|
+ if (!chunk)
|
|
+ break;
|
|
+ BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
|
|
+ VC_CMA_CHUNK_SIZE) != 0);
|
|
+ }
|
|
+ if (vc_cma_chunks_used != chunks_needed) {
|
|
+ LOG_ERR("%s: dma_alloc_from_contiguous failed (%d "
|
|
+ "bytes, allocation %d of %d)",
|
|
+ __func__, VC_CMA_CHUNK_SIZE,
|
|
+ vc_cma_chunks_used, chunks_needed);
|
|
+ goto out_release;
|
|
+ }
|
|
+
|
|
+ vchiq_add_connected_callback(vc_cma_connected_init);
|
|
+ }
|
|
+
|
|
+ rc = alloc_chrdev_region(&vc_cma_devnum, 0, 1, DRIVER_NAME);
|
|
+ if (rc < 0) {
|
|
+ LOG_ERR("%s: alloc_chrdev_region failed (rc=%d)", __func__, rc);
|
|
+ goto out_release;
|
|
+ }
|
|
+
|
|
+ cdev_init(&vc_cma_cdev, &vc_cma_fops);
|
|
+ rc = cdev_add(&vc_cma_cdev, vc_cma_devnum, 1);
|
|
+ if (rc != 0) {
|
|
+ LOG_ERR("%s: cdev_add failed (rc=%d)", __func__, rc);
|
|
+ goto out_unregister;
|
|
+ }
|
|
+
|
|
+ vc_cma_class = class_create(THIS_MODULE, DRIVER_NAME);
|
|
+ if (IS_ERR(vc_cma_class)) {
|
|
+ rc = PTR_ERR(vc_cma_class);
|
|
+ LOG_ERR("%s: class_create failed (rc=%d)", __func__, rc);
|
|
+ goto out_cdev_del;
|
|
+ }
|
|
+
|
|
+ dev = device_create(vc_cma_class, NULL, vc_cma_devnum, NULL,
|
|
+ DRIVER_NAME);
|
|
+ if (IS_ERR(dev)) {
|
|
+ rc = PTR_ERR(dev);
|
|
+ LOG_ERR("%s: device_create failed (rc=%d)", __func__, rc);
|
|
+ goto out_class_destroy;
|
|
+ }
|
|
+
|
|
+ vc_cma_proc_entry = proc_create(DRIVER_NAME, 0444, NULL, &vc_cma_proc_fops);
|
|
+ if (vc_cma_proc_entry == NULL) {
|
|
+ rc = -EFAULT;
|
|
+ LOG_ERR("%s: proc_create failed", __func__);
|
|
+ goto out_device_destroy;
|
|
+ }
|
|
+
|
|
+ vc_cma_inited = 1;
|
|
+ return 0;
|
|
+
|
|
+out_device_destroy:
|
|
+ device_destroy(vc_cma_class, vc_cma_devnum);
|
|
+
|
|
+out_class_destroy:
|
|
+ class_destroy(vc_cma_class);
|
|
+ vc_cma_class = NULL;
|
|
+
|
|
+out_cdev_del:
|
|
+ cdev_del(&vc_cma_cdev);
|
|
+
|
|
+out_unregister:
|
|
+ unregister_chrdev_region(vc_cma_devnum, 1);
|
|
+
|
|
+out_release:
|
|
+ /* It is tempting to try to clean up by calling
|
|
+ dma_release_from_contiguous for all allocated chunks, but it isn't
|
|
+ a very safe thing to do. If vc_cma_initial is non-zero it is because
|
|
+ VideoCore is already using that memory, so giving it back to Linux
|
|
+ is likely to be fatal.
|
|
+ */
|
|
+ return -1;
|
|
+}
|
|
+
|
|
+/****************************************************************************
|
|
+*
|
|
+* vc_cma_exit
|
|
+*
|
|
+***************************************************************************/
|
|
+
|
|
+static void __exit vc_cma_exit(void)
|
|
+{
|
|
+ LOG_DBG("%s: called", __func__);
|
|
+
|
|
+ if (vc_cma_inited) {
|
|
+ remove_proc_entry(DRIVER_NAME, NULL);
|
|
+ device_destroy(vc_cma_class, vc_cma_devnum);
|
|
+ class_destroy(vc_cma_class);
|
|
+ cdev_del(&vc_cma_cdev);
|
|
+ unregister_chrdev_region(vc_cma_devnum, 1);
|
|
+ }
|
|
+}
|
|
+
|
|
+module_init(vc_cma_init);
|
|
+module_exit(vc_cma_exit);
|
|
+MODULE_LICENSE("GPL");
|
|
+MODULE_AUTHOR("Broadcom Corporation");
|
|
--- /dev/null
|
|
+++ b/include/linux/broadcom/vc_cma.h
|
|
@@ -0,0 +1,29 @@
|
|
+/*****************************************************************************
|
|
+* Copyright 2012 Broadcom Corporation. All rights reserved.
|
|
+*
|
|
+* Unless you and Broadcom execute a separate written software license
|
|
+* agreement governing use of this software, this software is licensed to you
|
|
+* under the terms of the GNU General Public License version 2, available at
|
|
+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
|
|
+*
|
|
+* Notwithstanding the above, under no circumstances may you combine this
|
|
+* software in any way with any other Broadcom software provided under a
|
|
+* license other than the GPL, without Broadcom's express prior written
|
|
+* consent.
|
|
+*****************************************************************************/
|
|
+
|
|
+#if !defined( VC_CMA_H )
|
|
+#define VC_CMA_H
|
|
+
|
|
+#include <linux/ioctl.h>
|
|
+
|
|
+#define VC_CMA_IOC_MAGIC 0xc5
|
|
+
|
|
+#define VC_CMA_IOC_RESERVE _IO(VC_CMA_IOC_MAGIC, 0)
|
|
+
|
|
+#ifdef __KERNEL__
|
|
+extern void __init vc_cma_early_init(void);
|
|
+extern void __init vc_cma_reserve(void);
|
|
+#endif
|
|
+
|
|
+#endif /* VC_CMA_H */
|